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Abstract

We studied microcavity organic light-emitting devices with a microlens system. A microcavity for organic light-emitting devices (OLED) was fabricated by stacks of SiO2 and SiNx layers and a metal cathode together with the microlens array. Electroluminescence of the devices showed that color variation under the viewing angle due to the microcavity is suppressed remarkably by microlens arrays, which makes the use of devices acceptable in many applications. It was also demonstrated that the external out-coupling factor of the devise increases by a factor of ~1.8 with wide viewing angles compared to conventional OLEDs.

Fig. 3. The EL spectra from the OLED devices A (a) and B (b) for several different θs at V=10 V. The dotted line shows the reference EL spectrum of the device C. (c) A CIE chromaticity diagram showing the color variations of EL emission from devices A (blue squares), B (red circles), and C (white circles) for several θs with the NTSC standards.

Fig. 5. Top: photographs of the twin operating microcavity OLEDs at 10 V and θ~55° Middle: a microlens film with a slide glass was attached onto the left OLED by using index matching oil. Lower: the microlens film was attached onto the right OLED. The active area of each OLED is 3×3 mm2.